ML20092D924
| ML20092D924 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 06/05/1984 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| NJK-84-191, NUDOCS 8406220204 | |
| Download: ML20092D924 (2) | |
Text
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@ Commonwealth Edison Quad Citias Nucisar Powir Station 22710 206 Avenue North Corcova, Illinois 61242 1
Telephone 309/654-2241 NJK-84-191 June 5, 1984 Mr. Edson Case, Deputy Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Case:
Enclosed please find a listing of those changes, tests, and experiments completed during the month of June, 1984, for quad-Cities Station Units I and 2, DPR-29 and DPR-30. A summary of the safety evaluation is being reported in compliance with 10 CFR 50.59 Thirty-nine copies are provided for your use.
Respectfully, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION A
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N. J. Kalivianak s Station Superintendent NJ K:0K/bb Enclosure cc B. Rybak fgp6 8406220204 840605 PDR ADOCK 05000254 R
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Drywell Cooler, RBCCW Pump Trip Logic Change M-4-2-80-31 Description g
L In December, 1980, a Unit Two scram and Group l i solation occurred.
The Electromatic. Relief Valves were used to control Reactor pressure.
- A ' leaky flange on a relief valve discharge line caused the Drywell to exceed 2-psig.~
The high pressure tripped the Drywell coolers and RBCCW pumps, thus eliminating any method of cooling the Drywell and reducing the pressure. This modification eliminates the 2 psig trip of the
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coolers and pumps. The coolers and RBCCW pumps will only trip on a loss of off-site power, Evia Bus 13 and Bus 14 undervoltage-relays. The Drywell coolers are designed to operate up to approximately 5 psig. The coolers are administrative 1y controlled to be tripped if pressure rapidly exceeds 5.psig to prevent damage to the Drywell coolers.
Evaluation l
The 2 psig trip of the Drywell coolers and RBCCW pumps was originally 4
installed to prevent the blower motors from overheating ~dueto the higher air density. Their operation will have no affect on the cxisting auto-matic load 'shed features of the circuitry that are initiated by a loss of off-site. power, i'
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